A team of researchers managed to use human stem cells to restore the vision of blind laboratory mice. The team used photoreceptors derived from stem cells and suppressed the immune system long enough for the cells to become fully incorporated into the eyes. The details are in a paper that was just published in the journal Cell Stem Cell.
Photoreceptors are neurons—cells that transmit information through signal pathways, usually with the use of chemical or electrical signals. The cells are found in the retina and have become specialized to pass on information from the eyes to the full visual system.